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|Title:||Coulomb interactions and screening effects in few-layer black phosphorus: A tight-binding consideration beyond the longwavelength limit|
|Authors:||Prishchenko, D. A.|
Mazurenko, V. G.
Katsnelson, M. I.
Rudenko, A. N.
|Publisher:||IOP Publishing Ltd|
|Citation:||Coulomb interactions and screening effects in few-layer black phosphorus: A tight-binding consideration beyond the longwavelength limit / D. A. Prishchenko, V. G. Mazurenko, M. I. Katsnelson, et al. — DOI 10.1088/2053-1583/aa676b // 2D Materials. — 2017. — Vol. 4. — Iss. 2. — 025064.|
|Abstract:||Coulomb interaction and its screening play an important role in many physical phenomena of materials ranging from optical properties to many-body effects including superconductivity. Here, we report on a systematic study of dielectric screening in few-layer black phosphorus (BP), a twodimensional material with promising electronic and optical characteristics. We use a combination of a tight-binding model and rigorously determined bare Coulomb interactions, which allows us to consider relevant microscopic effects beyond the long-wavelength limit. We calculate the dielectric function of few-layer BP in the random phase approximation and show that it exhibits strongly anisotropic behavior even in the static limit. We also estimate the strength of effective local and non-local Coulomb interactions and determine their doping dependence. We find that the pz states responsible for low-energy excitations in BP provide a moderate contribution to the screening, weakening the on-site Coulomb interaction by less that a factor of two. Finally, we calculate the full plasmon spectrum of few-layer BP and discuss the effects beyond long-wavelengths. © 2017 IOP Publishing Ltd.|
RANDOM PHASE APPROXIMATIONS
TIGHT BINDING MODEL
|Appears in Collections:||Научные публикации, проиндексированные в SCOPUS и WoS CC|
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